Sofa



FIG. 1 is a perspective view of a sofa, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a side view thereof taken from the right of FIG. 2, the opposite side being a mirror image thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a top view thereof. 

CLAIM The ornamental design for a sofa, as shown and described. 